GEOLOGY and GROUND-WATER RESOURCES of the ISLAND of MOLOKAI, Hawall
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J '"'" ~ ...,.,, • - ;- • -:·-- __, - .. ~ ~ .:..; ,.,;: -~·t: '!' ; ... ~-- GEOLOGY AND GROUND-WATER RESOURCES OF THE ISLAND OF MOLOKAI, HAWAll H. T. STEARNS AND G. A. MACDONALD BULLETIN 11 HAWAII DIVISION OF HYDROGRAPHY 1947 BULLETINS OF THE DIVISION OF HYDROGRAPHY TERRITORY OF HAWAII * 1. GEOLOGY AND OROUND-WATER RESOURCES OF THE ISLAJ.\'D OF OAHU, HAW All. By Harold T. Stearns and Knute N. Vaksvik. 1935. * 2. GEOLOGIC MAP AND GUIDE OF THE ISLAND OF OAHU, HAWAil. By Harold T. Stearns. 1939. * 3. ANNOTATED BIBLIOGRAPHY AND INDEX OF GEOLOGY AND WATER SpPPLY OF THE ISLAND OF OAHU, HAWAII. By Norah D. Stearns. 1935. * 4. RECORDS OF THE DRILLED WELLS ON THE ISLAl:U> OF OAHU, HAWAll. By Harold T. Stearns and Knute N. Vaksvik. 1938. 5. SUPPLEMENT TO THE GEOLOGY AND GROU?-.'1>-WATER RESOURCES OF THE ISLAND OF OAHU, HAWAII. By Harold T. Stearns. Includes chapters on geo physical investigations by Joel H. Swartz, and petrography by Gordon A. Macdonald. 1940. 6. GEOLOGY AND GROUND-WATER RESOURCES OF THE ISLANDS OF LANAI AND KAHOOLAWE, fuWAil. By Harold T. Stearns. Includes chapters on geophysical investigations by Joel H. Swartz, and petrography by Gordon A. Macdonald. 1940. * 7. GEOLOGY AND GROUND-WATER RESOURCES OF THE ISLAND OF MAUI, HAWAII. By Harold T. Stearns and Gordon A. Macdonald, 1942. 8. GEOLOGY OF THE IlAWAIIAN ISLANDS. By H. T. Stearns. 1940. 9. GEOLOGY AND GROUND-WATER. RESOURCES OF THE ISLAND OF HAWAII. By Harold T. Stearns and Gordon A. Macdonald. 1946. 10, BIBLIOGRAPHY OF THE GEOLOGY Al).'1) GROUND-WATER RESOURCES OF THE ISLA1)."1l OF HAWAII. Annotated and indexed. By Gordon A. M.acdonald. 1947. 11. GEOLOGY AND GROUND-WATER RESODRCES OF THE ISLAND OF MOLOKAI, HAWAII. By Harold T. Stearns and Gordon .A.. Macdonald. 1047. TOPOGRAPHIC MAP OF THE ISLAND OF HAWAII, scale 1:125,000, contour in terval 250 feet, size 44 x 49 inches, price $1.00, for sale by the Survey Department, Territodal Ofilce Building, Honolulu 2, T. H. * Out of print. Plate 3. Aerial Yiew of :.\Iololrni from the east, sho,Ying the great northern diff 011 the right \Yith Kalaupapa Peninsula at its foot, in the right foreground the amphithenter-headed IInlawa Yalle~·. and in the middle distaiwe the great nillers of ,Yailau alld Pelekunn. the lwads of \Yhkh mark the positiou of the uuciP1it (·aldera. Photo l>y r. S. Army Air For<:e. TERRITORY OF HAWAII I.:-.GRAJ\1 J\1. :S'l'.·\I.:-.HACK, Gorernor A. LESTER MARKS, Gommis8ioner of Public Lands DIVISION OF HYDROGRAPHY MAX H, CARSOX, Chief Hydrographer BULLETIN 11 GEOLOGY AND GROUND-WATER RESO·URCES OF THE ISLAND OF MOLOKAI, HAW All BY HAROLD T. STEARNS Former District Geologist, U. S. Geological Survey AND GORDON A. MACDONALD District Geologist, U. S. Geological Survey Prepared in cooperation with the Geological Survey, United States Department of the Interior Printed in the Territory of Hawaii, rnited States of America; April 1947 Distributed by the U. S. (;eoJogieal Sm·,·py, 333 Federal Bldg.. Honolulu, Hawaii CONTENTS PAGE Abstract 1 PART 1. GEOLOGY OF 1\foLOKAI, by H. T. Stearns........................ 3 Introduction . 3 Location and area. 3 Historical sketch . 3 Population and industries. 5 History and purpose of the investigation. 6 Acknowledgments . 7 Previous investigations . 7 Geomorphology . 11 Original form of East Molokai. 11 Origin of the Hoolehua Plain....................................... 13 Emerged and submerged shureli11es. 13 Living reef . 15 General character, age, and water-bearing properties of the rocks. 15 Straligravllk lable of Molokai ..........................Facing page 16 Tertiary volcanic rocks. 16 East Molokai volcanic series. 16 Lower member . 16 Lava flows . 16 Cones and vitric tuff deposits.............................. 17 Intrusives . .. 17 Caldera complex . 19 Upper member . 22 Lava flows . 22 Cones and bulbous domes. 23 Erosional unconformity . 23 West Molokai volcanic series . 2R Distribution . 23 Character and structure. 24 Cones and vitric tuff deposits. 24 Dikes . ... 25 Quaternary volcanic rocks. 25 Kalaupapa basalt . 25 Tuff of Mokuhooniki cone. 26 Sedimentary rocks . 26 Calcareous marine deoosits. 26 Consolidated earthy deposits. 27 Consolidated dunes . 28 Unconsolidated dunes . 28 Beach deposits . 29 Unconsolidated earthy deposits...... 29 Geologic structure . 29 East Molokai . 29 West Molokai . 31 Geologic history . 31 Road metal . 35 iii CONTENTS PAGE PART 2. GROUND-WATKli RESOURCES OF :rtlOLOii:AI, by G. A. Macdonald .... 37 Climate ............ · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · 37 Temperature, wind, and humidity.................................. 37 Rainfall ......................................................... 37 Surface water ....................................................... 47 Meyer Lake ...................................................... 49 Domestic water supplies..................................._........... 50 Basal ground water.................................................. 53 General features ................................................. 53 Basal Springs .................................................... 56 Wells 57 Perched ground water ............................................... 67 General f Pa tnrPR . ......................... 67 Perched springs .................................................. 67 Tunnels developing perched ground water........................... 71 Water confined at high levels by dikes ................................. 72 Quality of ground water.............................................. 77 Use of water from the large windward valleys ......................... 79 Future developments ................................................ 84 PART 3. PETROGRAPHY OF l\foLOKAI, by G. A. Macdonald................. 89 Abstract ....................................................·........ 89 Introduction ........................................................ 89 Previous investigations .............................................. 90 Tertiary volcanic rocks ............................................... 92 East Molokai volcanic series....................................... 92 Lower member ................................................ 92 General characteristics ..................................... 92 Olivine basalts ............................................. 95 Basalts .................................................... 97 Picrite-basalts .............................................. 98 Upper member ................................................ 99 General features ............................................ 99 Oligoclase andesites ........................................ 99 Andesine andesites . 103 Trachytes . 103 Inclusions in lavas. 104 Intrusive rocks . 104 West Molokai volcanic series....................................... 105 General features ............................................... 105 Olivine basalts . 105 l'icrite-basalts .................................................. 107 Basalts ........................................................ 107 Hypersthene-bearing basalts . 108 Quaternary volcanic rocks. 109 Kalaupapa basalt .............................................. 109 Tuff of l\fokuhooniki cone. 109 Magmatic differentiation .............................................. 109 ILLUSTR.A.TIOXS PLATE FACINfl PACE 1. Geologic and topographic map of Molokai. sho,ving wells, springs, and tunnels .............................................. .In pocket 2. Map of Molokai showing principal roads and points of geologic inter- est, with a descriptive text..................................In pocket 3. Aerial view of Molokai from the east........................Frontispiece 4. Kalaupapa Peninsula, and the northern cliff of :Molokai . 14 5. A-Aerial view of Pelekunu Valley. B-Boulders rounded by wave action during a high stand of the sea. 15 6. A-Southern slope of East Molokai. B-Armored desert 011 ·west ~Iolokai . 20 7. A-Head of Kamalo Gulch, East Molokai. B-Sea cliff near :Mokio Point, West Molokai. 21 8. A-Kalaupapa Peninsula from Waikolu Valley. B-Reef of the 25- foot stand of the sea, near Kaunakakai. 26 9. A-Beach rock, near Halena, West Molokai. B-Terraces at mouth of Waileia Valley.............................................. 27 10. A-Lithified sand dunes near Ilio Point, West ::Vlolokai. B-Lithified sand dunes near Moomomi Beach. 46 11. Aerial view of Halawa Valley, East Molokai....................... 47 12. A-Fault scarps and graben, on eastern slope of West Molokai. B- J\Ieyer Lake . 74 13. A-Aerial view of Papalaua Valley. B-Ohialele Stream, in Waikolu Valley . ..